Anchorage zone behavior and strength prediction of high-performance concrete containing coarse aggregate confined with spirals

High-performance concrete containing coarse aggregate (HPC-CA) has superior cost efficiency and reduced early cracking risk compared with traditional UHPC. HPC-CA is distinguished by high strength, lightweight, superior durability and rapid growth of early strength, presenting promising in prefabric...

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Bibliographic Details
Published in:Archives of Civil and Mechanical Engineering 2023-10, Vol.23 (4), p.257, Article 257
Main Authors: Li, Sheng, Zheng, Wenzhong, Zhou, Wei, Li, Ruisen, Qiu, Xianyelin
Format: Article
Language:English
Subjects:
Anchorages
Bearing capacity
Cement
Civil Engineering
Concrete
Concrete aggregates
Concrete slabs
Design
Efficiency
Energy consumption
Engineering
Mechanical Engineering
Mechanical properties
Original Article
Post-tensioning
Prediction models
Prefabricated buildings
Prestressed concrete
Raw materials
Spirals
Strain hardening
Structural Materials
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Summary:High-performance concrete containing coarse aggregate (HPC-CA) has superior cost efficiency and reduced early cracking risk compared with traditional UHPC. HPC-CA is distinguished by high strength, lightweight, superior durability and rapid growth of early strength, presenting promising in prefabricated industry and prestressed structures. However, extreme brittleness will generate non-ductile failures, thus spiral secondary reinforcement is usually used to improve ductility. Certain differences existed between HPC-CA and ordinary-strength concrete in microstructure and macroscopic mechanical properties, and the existing code provisions cannot be directly applied to HPC-CA. Some fundamental knowledge gaps need to be filled to improve understanding of the post-tensioned HPC-CA structures, including the anchorage zone behaviors of HPC-CA confined with spirals as well as the establishment of bearing capacity calculation methods. For this purpose, 10 specimens were designed and tested under local pressure based on the unbonded prestressed concrete slabs. The cracking patterns, failure characteristics, load–deformation relationships, load–spiral strain curves and wedge features were obtained. Besides, a calculation equation was developed to predict the local bearing capacity of HPC-CA with spirals. Meanwhile, a general bearing capacity prediction model serving the anchorage zone design was established and verified with the tested results and specification formulas.
ISSN:2083-3318
1644-9665
2083-3318
DOI:10.1007/s43452-023-00801-9